1: 92 percent / 85percent aq. H2SO4 / CH2Cl2 / 3 h / Ambient temperature 2: 69 percent / SnCl2*2H2O / ethyl acetate / 3 h / Heating 3: n-pentyl nitrite, 36percent aq. HCl / methanol / 0.25 h / 0 °C 4: 10percent aq. NaOH / Ambient temperature 5: 97 percent / 30percent aq. NaOH / methanol / 2 h / Heating View Scheme

Multi-step reaction with 2 steps 1: 92 percent / 85percent aq. H2SO4 / CH2Cl2 / 3 h / Ambient temperature2: 69 percent / SnCl2*2H2O / ethyl acetate / 3 h / Heating  

With  sulfuric acid in  dichloromethane 3 h;  Ambient temperature;